High-sensitivity random laser acoustic emission sensor for damage detection of buoyant material

Wentao Zhang; Bing Lv; Zehua Zhao; Kaiqi Yan; Wenzhu Huang

doi:10.1117/12.2613799

26 July 2022 High-sensitivity random laser acoustic emission sensor for damage detection of buoyant material

Wentao Zhang, Bing Lv, Zehua Zhao, Kaiqi Yan, Wenzhu Huang

Proceedings Volume 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 122790H (2022) https://doi.org/10.1117/12.2613799
Event: 2021 International Conference on Optical Instruments and Technology, 2022, Online Only

Abstract

The random fiber laser (RFL) combining a 3×3 coupler phase interrogation technique is demonstrated and applied to acoustic emission (AE) detection for damage detection of buoyant materials. The random chirped grating array (RCGA) is used to provide random distributed feedback and act as an AE sensing head. The random distributed feedback inside RCGA significantly extends the effective cavity length of the RFL, thus reduces the thermal frequency noise of the RFL and improves the resolution of AE signal. A π-phase-shifted fiber Bragg grating (π-FBG) loop mirror is used as a wavelength locking to ensure a stable and narrow lasing. A high AE signal resolution of 2.6×10^-7 pm/√Hz@10 kHz is achieved.

Citation Download Citation

Wentao Zhang, Bing Lv, Zehua Zhao, Kaiqi Yan, and Wenzhu Huang "High-sensitivity random laser acoustic emission sensor for damage detection of buoyant material", Proc. SPIE 12279, 2021 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 122790H (26 July 2022); https://doi.org/10.1117/12.2613799

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